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HA is a weak acid. The pH of 0.1 M HA s...

HA is a weak acid. The pH of 0.1 M HA solution is 2. What is the degree of dissociation `(alpha)` of HA ?

A

0.5

B

0.2

C

0.1

D

0.301

Text Solution

Verified by Experts

The correct Answer is:
C
`pH=2` means `[H^(+)] =10^(-2)M`
`{:(,HA,hArr,H^(+),+,A^(-)),("Initial",cM,,,,),("At eqm.",c(1-alpha)M,,calpha,,calpha):}`
`:. [H^(+)]=c alpha` or `alpha=([H^(+)])/(c )`
`alpha=(10^(-2))/(10^(-1))=10^(-1)=0.1`
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Knowledge Check

  • The pH of a 0.1 M aqueous solution of a weak acid (HA) is 3. What is its degree of dissociation ?

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    C
    `50%`
    D
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    A
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